Instant

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- Introduce env var ``INSTANT_SYSTEM_CALL_METHOD`` for switching method
for calling external programs and introduce possibly OFED-fork safe
implementation

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- Add ``file_lock`` which can be used within a ``with`` statement
- Introduce ``set_log_level`` and deprecate ``set_logging_level``

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- Allow to use CMake instead of distutils/pkg-config

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- Converting python2 syntax to python3 (run 2to3)
- Patch to make instant work with python2
- Cache dir is now created if not existing

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- Copy all files to ``~/.instant/error/module_name`` when Instant fails
- If environment variable ``INSTANT_DISPLAY_COMPILE_LOG`` is set the
content of ``compile.log`` will be displayed
- Removed copying of ``compile.log`` to ``~/.instant/error/``

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- Added support for flufl.lock for NFS safe file locking